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Call a function in a shared library/OCaml: Difference between revisions
Call a function in a shared library/OCaml (view source)
Revision as of 21:14, 17 May 2010
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Line 13:
| String of string
| Ptr of pointer
| Void
type return_type =
Line 20 ⟶ 21:
| Return_string
| Return_ptr
| Return_void
type rtld_flags =
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ffi_status status;
ffi_type *rtype;
int ffi_prep_cif_failed = 0;
nargs = Wosize_val(ml_args);
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arg_values[i] = &Field(v,0);
} break;
case 5: /* Void */
caml_invalid_argument("fficall");
break;
}
}
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case 4: /* Return_ptr */
rtype = &ffi_type_pointer;
break;
case 5: /* Return_void */
rtype = &ffi_type_uint;
break;
}
status = ffi_prep_cif(&cif, FFI_DEFAULT_ABI, nargs, rtype, arg_types);
if (status != FFI_OK) {
ffi_prep_cif_failed = 1;
goto freeandfail;
failwith("ffi_prep_cif");▼
}
Line 243 ⟶ 249:
ffi_call(&cif, (void (*)(void)) func_handle, &result, arg_values);
ml_ret = Val_tagged( (value) result, 4);
} break;
case 5: /* Return_void */
{ ffi_arg result;
ffi_call(&cif, (void (*)(void)) func_handle, &result, arg_values);
ml_ret = Val_int(0);
} break;
}
freeandfail:
for (i = 0; i < nargs; i++) {
switch (Tag_val(Field(ml_args, i))) {
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free(arg_values);
free(arg_types);
if (ffi_prep_cif_failed)
▲ failwith("ffi_prep_cif");
CAMLreturn(ml_ret);
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Here is the '''"Makefile"''':
<lang make>FFI_LIBS := $(shell pkg-config --libs libffi)▼
▲FFI_LIBS := $(shell pkg-config --libs libffi)
FFI_CFLAGS := $(shell pkg-config --cflags libffi)
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rm -f *.[oa] *.so *.cm[ixoa] *.cmxa *.opt
</lang>
sed -i "s/ /\t/g" Makefile
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| String v -> Printf.printf "ocaml: got (String \"%s\")\n%!" v
| Ptr _ -> Printf.printf "ocaml: got (Ptr)\n%!"
| Void -> Printf.printf "ocaml: got (Void)\n%!"
let main1() =
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let func = dlsym ~lib ~func_name:"func_float_param" in
handle_return(fficall ~func ~args:[| Float 211.7 |] ~return:Return_float);
dlclose ~lib;
;;
let main6() =
let lib = dlopen "./fakelib.so" [RTLD_LAZY] in
let func = dlsym ~lib ~func_name:"func_void_param" in
handle_return(fficall ~func ~args:[| |] ~return:Return_void);
dlclose ~lib;
;;
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print_newline(); main4();
print_newline(); main5();
print_newline(); main6();
;;</lang>
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printf("c: got float (%g)\n", f); fflush(stdout);
return 233.2;
}
void func_void_param(void)
{
printf("c: void function\n"); fflush(stdout);
}
</lang>
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